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| 型号： | ADP2114-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 35/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 3.3V/1.8V |
| 设计资源： | Powering AD9268 with ADP2114 for Increased Efficiency (CN0137) |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 可调 |
| 电流 - 输出： | 4A，2A |
| 输入电压： | 2.75 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz，600kHz，1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2114 |
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Data Sheet
POWER DISSIPATION, THERMAL CONSIDERATIONS
ADP2114
Power dissipated by the ADP2114 dual switching regulator is a
major factor that affects the efficiency of the two dc-to-dc
converters. The efficiency is given by
Transition losses occur because the P-channel power MOSFET
cannot be turned on or off instantaneously. The amount of
transition loss is calculated by
Efficiency ?
P OUT
P IN
? 100%
(21)
P TRAN = V IN × I OUT × ( t RISE + t FALL ) × f SW
where t RISE and t FALL are the rise time and the fall time of the
(26)
where:
P IN is the input power.
P OUT is the output power.
Power loss is given by P LOSS = P IN ? P OUT .
switching node, SW. In the ADP2114, the rise and fall times of
the switching node are in the order of 5 ns.
The power dissipated by the regulator increases the die junction
temperature, T J , above the ambient temperature, T A .
The power loss of the step-down dc-to-dc converter is
approximated by
T J = T A + T R
where the temperature rise, T R , is proportional to the power
(27)
P LOSS = P D + P L
where:
P D is the power dissipation on the ADP2114.
(22)
dissipation in the package, P D .
The proportionality coefficient is defined as the thermal resistance
from the junction of the die to the ambient temperature.
P L is the inductor power losses.
T R = θ JA × P D
(28)
The inductor losses are estimated (without core losses) by
P L ? I OUT2 × DCR L
(23)
where θ JA is the junction-ambient thermal resistance (34°C/W
where:
I OUT is the dc load current.
DCR L is the inductor series resistance.
The ADP2114 power dissipation, P D , includes the power switch
conductive losses, the switch losses, and the transition losses of
each channel.
The power switch conductive losses are due to the output current,
I OUT , flowing through the PMOSFET and the NMOSET power
switches that have internal resistance, R DSON . The amount of
conductive power loss is found by
When designing an application for a particular ambient
temperature range, calculate the expected ADP2114 power
dissipation (P D ) due to conductive, switching, and transition
losses of both channels by using Equation 24, Equation 25,
and Equation 26 and estimate the temperature rise by using
Equation 27 and Equation 28. The reliable operation of the
two converters can be achieved only if the estimated die junction
temperature of the ADP2114 (Equation 27) is less than 125°C.
Therefore, at higher ambient temperatures, reduce the power
dissipation of the system. Figure 83 provides the power derating
for the elevated ambient temperature at different air flow
P COND = [ R DSON-P × D + R DSON-N × (1 ? D )] × I OUT2
(24)
conditions. The area below the curves is the safe operation area
where the duty-cycle, D, = V OUT /V IN .
Switching losses are associated with the current drawn by the
for ADP2114 dual regulators.
2.2
driver to turn on and turn off the power devices at the switching
frequency. The amount of switching power loss is given by
2.0
1.8
AIR VELOCITY = 500 LFM
AIR VELOCITY = 200 LFM
P SW = ( C GATE-P + C GATE-N ) × V IN2 × f SW
where:
C GATE-P is the PMOSFET gate capacitance.
C GATE-N is the NMOSFET gate capacitance.
(25)
1.6
1.4
1.2
1.0 AIR VELOCITY = 0 LFM
0.8
0.6
0.4
0.2
0
70
85
100
115
AMBIENT TEMPERATURE (°C)
Figure 83. Power Dissipation Derating (JEDEC 1S2P Board)
Rev. B | Page 35 of 40
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2114-EVALZ | 制造商:Analog Devices 功能描述:4A Step-Down DC/DC Converter Evaluation 制造商:Analog Devices 功能描述:ADP2114, DC TO DC CONVERTER, STEP DOWN, EVAL BOARD |
| ADP2116 | 制造商:AD 制造商全称:Analog Devices 功能描述:Configurable, Dual 3 A/Single 6 A, Synchronous, Step-Down DC-to-DC Regulator |
| ADP2116ACPZ-R7 | 功能描述:IC REG BUCK SYNC ADJ 32LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| ADP2116ACPZ-R7 | 制造商:Analog Devices 功能描述:DC/DC CONVERTER IC |
| ADP2116-BL1-EVZ | 功能描述:EVAL BOARD FOR ADP2116 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
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